No cant kill him.........even if he is ugly but as you say ....useful, have at least 3 here and they keep away the flys and all other nasty flying bugs............ooopppps hes on the move again.......coming my way but has a silly grin on his face..............oh I see theres a lady spider in the other corner...........thats another one gone....they gio see her and she eats them.....thats life I suppose